International Travel - What does Magenta MAX Plans Cover?

¡Hola a todos!

Next month, my friends and I will be traveling to Europe for about two weeks. We will be using Delta Airlines and will also be taking a Royal Caribbean cruise for one of the two weeks.

The countries that we will be visiting will include:

• Italia
• Grecia
• Croacia
• Francia

I recently switched to T-Mobile last week and am currently on the Magenta Max plan. While the representative that assisted me at the store was very informative, I realized belatedly that I had forgotten to ask a few questions in regards to how my plan will keep me connected during my trip. I have done a few searches on the website, but I feel like it doesn't fully answer the questions that I have unless I am somehow overlooking it.

1. The website mentions GoGo InFlight Wi-Fi - assuming that my flights allows me to utilize this, will it be unlimited or just one hour of usage? There would be 5 flights in two weeks, so if they all have this would that cover all flights or is there a limit to how many times I could use it?
2. The website also says that for Magenta Max plans, I would give unlimited data and text and low-rate calling while traveling abroad for the aforementioned countries - is this true? Would there be any additional fees for using my data or texting? I am not sure how roaming works.
3. Would I still have service during the cruise? I'm sure it may be spotty as there would be a few days at sea, but would it still somewhat work? I assume it would also have unlimited data and text and low-rate calling, but I have the same question about additional fees. And again, no idea how roaming works.
4. Are there additional charges I should be concerned about?

I apologize for the many questions and wordiness of my post. I just want to be sure I am prepared in advance. Thank you to whoever takes the time to read this and answer any of my questions!